Regarding the photo of the Univ Boat Club (Oxford Today, Trinity 2015, pp. 32-3), I’m pretty sure it must have been taken in 1962, not 1961. I recognise several of my contemporaries, including one who became a good friend, and we all matriculated in October 1961. The photo looks as if it was taken in spring/summer.
I believe Hawking graduated in 1962.